main.c

   char *nl = NULL;
   char *retval = NULL;

   do {
     if (NULL == fgets(buf, sizeof(buf), fp))
       break;
     if (NULL == retval)
       retval = strdup(buf);
     else {
       if (NULL == (retval = realloc(retval,
                                     strlen(retval) + strlen(buf) + 1)))
         break;
       strcat(retval, buf);
     }
   }
   while (NULL == (nl = strchr(retval, '\n')));

   if (NULL != nl)
     *nl = '\0';

   return retval;
}


/* Create the needed directory hierarchy recursively in order to save
   multi-GETs in file output, ie:
   curl "http://my.site/dir[1-5]/file[1-5].txt" -o "dir#1/file#2.txt"
   should create all the dir* automagically
*/
static int create_dir_hierarchy(char *outfile)
{
  char *tempdir;
  char *tempdir2;
  char *outdup;
  char *dirbuildup;
  int result=0;

  outdup = strdup(outfile);
  dirbuildup = malloc(sizeof(char) * strlen(outfile));
  if(!dirbuildup)
    return -1;
  dirbuildup[0] = '\0';

  tempdir = strtok(outdup, DIR_CHAR);

  while (tempdir != NULL) {
    tempdir2 = strtok(NULL, DIR_CHAR);
    /* since strtok returns a token for the last word even
       if not ending with DIR_CHAR, we need to prune it */
    if (tempdir2 != NULL) {
      if (strlen(dirbuildup) > 0)
        sprintf(dirbuildup,"%s%s%s",dirbuildup, DIR_CHAR, tempdir);
      else {
        if (0 != strncmp(outdup, DIR_CHAR, 1))
          sprintf(dirbuildup,"%s",tempdir);
        else
          sprintf(dirbuildup,"%s%s", DIR_CHAR, tempdir);
      }
      if (access(dirbuildup, F_OK) == -1) {
        result = mkdir(dirbuildup,(mode_t)0000750);
        if (-1 == result) {
          switch (errno) {
#ifdef EACCES
          case EACCES:
            fprintf(stderr,"You don't have permission to create %s.\n",
                    dirbuildup);
            break;
#endif
#ifdef ENAMETOOLONG
          case ENAMETOOLONG:
            fprintf(stderr,"The directory name %s is too long.\n",
                    dirbuildup);
            break;
#endif
#ifdef EROFS
          case EROFS:
            fprintf(stderr,"%s resides on a read-only file system.\n",
                    dirbuildup);
            break;
#endif
#ifdef ENOSPC
          case ENOSPC:
            fprintf(stderr,"No space left on the file system that will "
                    "contain the directory %s.\n", dirbuildup);
            break;
#endif
#ifdef EDQUOT
          case EDQUOT:
            fprintf(stderr,"Cannot create directory %s because you "
                    "exceeded your quota.\n", dirbuildup);
            break;
#endif
          default :
            fprintf(stderr,"Error creating directory %s.\n", dirbuildup);
            break;
          }
          break; /* get out of loop */
        }
      }
    }
    tempdir = tempdir2;
  }
  free(dirbuildup);
  free(outdup);

  return result; /* 0 is fine, -1 is badness */
}

#ifdef __DJGPP__
/* The following functions are taken with modification from the DJGPP
 * port of tar 1.12. They use algorithms originally from DJTAR. */

char *
msdosify (char *file_name)
{
  static char dos_name[PATH_MAX];
  static const char illegal_chars_dos[] = ".+, ;=[]|<>\\\":?*";
  static const char *illegal_chars_w95 = &illegal_chars_dos[8];
  int idx, dot_idx;
  char *s = file_name, *d = dos_name;
  const char *illegal_aliens = illegal_chars_dos;
  size_t len = sizeof (illegal_chars_dos) - 1;
  int lfn = 0;

  /* Support for Windows 9X VFAT systems, when available.  */
  if (_use_lfn (file_name))
    lfn = 1;
  if (lfn) {
    illegal_aliens = illegal_chars_w95;
    len -= (illegal_chars_w95 - illegal_chars_dos);
  }

  /* Get past the drive letter, if any. */
  if (s[0] >= 'A' && s[0] <= 'z' && s[1] == ':') {
    *d++ = *s++;
    *d++ = *s++;
  }

  for (idx = 0, dot_idx = -1; *s; s++, d++) {
    if (memchr (illegal_aliens, *s, len)) {
      /* Dots are special: DOS doesn't allow them as the leading character,
         and a file name cannot have more than a single dot.  We leave the
         first non-leading dot alone, unless it comes too close to the
         beginning of the name: we want sh.lex.c to become sh_lex.c, not
         sh.lex-c.  */
      if (*s == '.') {
        if (idx == 0 && (s[1] == '/' || (s[1] == '.' && s[2] == '/'))) {
          /* Copy "./" and "../" verbatim.  */
          *d++ = *s++;
          if (*s == '.')
            *d++ = *s++;
          *d = *s;
        }
        else if (idx == 0)
          *d = '_';
        else if (dot_idx >= 0) {
          if (dot_idx < 5) { /* 5 is a heuristic ad-hoc'ery */
            d[dot_idx - idx] = '_'; /* replace previous dot */
            *d = '.';
          }
          else
            *d = '-';
        }
        else
          *d = '.';

        if (*s == '.')
          dot_idx = idx;
      }
      else if (*s == '+' && s[1] == '+') {
        if (idx - 2 == dot_idx) { /* .c++, .h++ etc. */
          *d++ = 'x';
          *d   = 'x';
        }
        else {
          /* libg++ etc.  */
          memcpy (d, "plus", 4);
          d += 3;
        }
        s++;
        idx++;
      }
      else
        *d = '_';
    }
    else
      *d = *s;
    if (*s == '/') {
      idx = 0;
      dot_idx = -1;
    }
    else
      idx++;
  }

  *d = '\0';
  return dos_name;
}

char *
rename_if_dos_device_name (char *file_name)
{
  /* We could have a file whose name is a device on MS-DOS.  Trying to
   * retrieve such a file would fail at best and wedge us at worst.  We need
   * to rename such files. */
  char *base;
  struct stat st_buf;
  char fname[PATH_MAX];

  strcpy (fname, file_name);
  base = basename (fname);
  if (((stat(base, &st_buf)) == 0) && (S_ISCHR(st_buf.st_mode))) {
    size_t blen = strlen (base);

    /* Prepend a '_'.  */
    memmove (base + 1, base, blen + 1);
    base[0] = '_';
    strcpy (file_name, fname);
  }
  return file_name;
}

#endif /* __DJGPP__ */